The energy-saving link of hydraulic excavator mainly lies in the hydraulic pump. Based on the different circuits of hydraulic pump, the energy-saving methods are also different.
1. Multi pump drive circuit
Single ration pump is the most basic pump in hydraulic system, and its application range is also greatly limited. If the operation requires multi speed and multi load, the working efficiency of single ration pump will be less than 35%. Therefore, the drive circuit matches the hydraulic excavator with multi load and multi hydraulic, and the power consumption can be reduced by 50%.
2. Pressure matching hydraulic circuit. Compared with the ordinary circuit, the relief valve in the pressure matching hydraulic circuit can be used as a pressure compensation method in addition to eliminating the excess oil, which ensures that when the load changes, the inlet and outlet pressure difference of the throttle valve is a constant. From the point of view of energy saving, the working pressure of the hydraulic pump can automatically adapt to the load pressure, and it is always larger than the load pressure, so as to improve the efficiency and reduce the loss.
